Design for a seat



FIG. 1 is a front perspective view of a first embodiment of my design for a seat shown in the form of a bench;

FIG. 2 is a rear perspective view thereof, the opposite side being identical in all respects;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof; and

FIG. 6 is a side elevational view thereof. 

The ornamental design for a seat, as shown and described. 